CN114529166A - Power distribution network operation safety risk early warning method and system - Google Patents

Abstract

The invention provides a power distribution network operation safety risk early warning method and a power distribution network operation safety risk early warning system, wherein the power distribution network operation safety risk early warning method comprises the following steps: acquiring equipment to be overhauled, and searching the position of the equipment to be overhauled by combining a network topological graph; the method comprises the steps of analyzing a network topological graph to obtain loads carried by equipment to be overhauled based on the position of the equipment to be overhauled, comprehensively judging risk levels based on load levels and loss load sums to obtain weak links of operation of the power distribution network and give corresponding control measures, comprehensively forming a risk early warning report by on-line information and outputting the risk early warning report, accurately outputting risk information, reducing the occurrence probability of operation faults of the power distribution network to the minimum, and improving the safety and reliability of operation of the power distribution network.

Description

A method and system for early warning of distribution network operation safety risk

technical field

The invention belongs to the technical field of power grid topology analysis, and in particular relates to a method and system for early warning of power distribution network operation safety risks.

Background technique

The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

With the continuous increase of domestic and industrial electricity consumption, the scale of the power grid continues to expand, the network structure tends to be complicated, and the work of equipment maintenance and line maintenance increases greatly, which increases the uncertainty of power grid operation.

At present, most of the power grid operation arrangements still rely on non-intelligent means such as manual checking, which leads to complicated early warning work by grid dispatchers, and low efficiency and poor reliability for risk information analysis and reporting of early warning information.

SUMMARY OF THE INVENTION

In order to solve the technical problems existing in the above background technology, the present invention provides a method and system for early warning of distribution network operation safety risks, which can carry out accurate risk early warning, minimize the probability of occurrence of distribution network operation failures, and improve the power grid. Operational safety and reliability.

In order to achieve the above object, the present invention adopts the following technical solutions:

A first aspect of the present invention provides a distribution network operation safety risk early warning method, which includes:

Obtain the equipment to be repaired, and retrieve the location of the equipment to be repaired in combination with the network topology map;

Based on the location of the equipment to be repaired, analyze the network topology map to obtain the load carried by the equipment to be repaired, and determine whether the load carried by the equipment to be repaired is an important load; if it is an important load, check whether the important load has a backup power supply path, and if so , then start the backup power supply path and update the network topology; if there is no backup power supply path, the load will lose power, and the risk level will be determined based on the importance level of the lost load; if the equipment to be repaired does not carry an important load, calculate the The sum of the lost loads when the maintenance equipment is out of service, and the risk level is determined based on the sum of the lost loads.

Further, it also includes: after starting the backup power supply path, based on the network topology map, retrieving the lines on the backup power supply path and the operation and maintenance unit of the plant and station, and generating and sending risk management and control measures to the operation and maintenance unit.

Further, it also includes: based on the position of the equipment to be repaired, the load carried by the equipment to be repaired, the risk level and the risk control measures, combined with the template of the early warning notice, to generate an early warning notice.

Further, the network topology map includes an AC line segment library, a new energy plant station library, an important load library, an operation and maintenance department library, and a plant station database of multiple voltage levels.

Further, the method for calculating the sum of the lost loads is: to find out whether the load carried by the equipment to be repaired has a backup power supply path, if so, start the backup power supply path and update the network topology; if the load carried does not have a backup power supply path, Then the load is de-energized, and the sum of all de-energized loads is the sum of the lost loads.

A second aspect of the present invention provides a distribution network operation safety risk warning system, which includes:

a risk location module, which is configured to: obtain the equipment to be repaired, and combine with the network topology map to retrieve the location of the equipment to be repaired;

The risk analysis module is configured to: based on the location of the equipment to be repaired, analyze the network topology map to obtain the load carried by the equipment to be repaired, and determine whether the load carried by the equipment to be repaired is an important load; if it is an important load, find important loads. Whether the load has a backup power supply path, if so, start the backup power supply path and update the network topology; if there is no backup power supply path, the electric charge will be lost, and the risk level will be determined based on the importance level of the lost load; if it is to be repaired If the equipment does not carry an important load, the sum of the loss loads when the equipment to be repaired is out of service is calculated, and the risk level is determined based on the sum of the loss loads.

Further, it also includes a risk management and control module, which is configured to: after starting the standby power supply path, based on the network topology map, retrieve the lines on the standby power supply path and the operation and maintenance unit of the plant station, and send an operation and maintenance instruction to the operation and maintenance unit. unit.

Further, it also includes a risk early warning module, which is configured to: based on the position of the equipment to be repaired, the load carried by the equipment to be repaired, the risk level and the operation and maintenance unit on the standby power supply path, combined with the template of the early warning notice, Generate alert notifications.

A third aspect of the present invention provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, implements the steps in the above-mentioned method for early warning of a distribution network operation safety risk.

A fourth aspect of the present invention provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the above-mentioned one when executing the program Steps in a distribution network operation safety risk early warning method.

Compared with the prior art, the beneficial effects of the present invention are:

The invention provides an early warning method for the safety risk of distribution network operation, which uses the topology structure of the power grid to track and locate the position of equipment that needs to be repaired or maintained, and then carries out risk analysis and evaluation to determine the weak links in the operation of the distribution network, and Putting forward corresponding measures, coordinating the above information to form a risk warning report, not only reduces the workload of the staff, but also takes measures in advance for the weak links in the operation of the distribution network, which can minimize the probability of the occurrence of faults in the operation of the distribution network. Improve the safety and reliability of power grid operation.

Description of drawings

The accompanying drawings forming a part of the present invention are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation of the present invention.

Fig. 1 is the overall flow chart of the risk early warning method of Embodiment 1 of the present invention;

2 is a network topology diagram of a power distribution network according to Embodiment 1 of the present invention;

Fig. 3 is the flow chart of the risk analysis of the first embodiment of the present invention;

Fig. 4 is the flow chart of the 220kV early warning system of the first embodiment of the present invention;

Fig. 5 is the flow chart of the 110kV early warning system according to the first embodiment of the present invention;

FIG. 6 is a flow chart of the 35kV early warning system according to the first embodiment of the present invention.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

Example 1

This embodiment provides a distribution network operation safety risk warning method, as shown in FIG. 1 , which specifically includes the following steps:

Step 1. Build a grid topology diagram.

The scale of the distribution network is large, the number of plants at all levels is large, the scale of the transmission line is even larger, and the importance levels of the loads are different. In order to clearly display the grid structure of the distribution network, the complete plant station and plant At the same time, better interactivity is achieved, and a plant and station database (35kV database, 110kV database and 220kV database) including AC line segment library, voltage level classification database (35kV database, 110kV database and 220kV database), new energy plant station library, The network topology diagram of the seven libraries, the important load library and the operation and maintenance department library.

As an implementation manner, the Excel platform is used for topology construction, and network topology diagrams of seven libraries are constructed. Show the connection relationship between plants, lines, and loads in the distribution network.

As shown in Fig. 2, the constructed network topology diagram has established seven topology libraries. The AC line segment library includes transmission lines with four voltage levels of 10kV, 35kV, 110kV, and 220kV. Each plant and station in the distribution network is like scattered points. The AC line segment library connects the points into lines and staggers them into a network. The grid structure of the distribution network; the 220kV database includes the incoming lines of the 220kV plant and station, the outgoing lines of various voltage levels and the important loads they carry. The 220kV plant and station is an important part of the distribution network system, and most of its outgoing lines are 110kV The incoming lines of the plant and the 35kV plant, so each outgoing line needs to be clearly presented; the 110kV database includes the 110kV incoming line and its superior plants, the outgoing lines of each voltage level and the important loads; the 35kV database contains the 35kV incoming line The important load bank divides the load into the first-level important load, the second-level important load and the high-risk households. The first-level user is the most important load user, and there are generally two or more lines from different plants and stations. Power supply to avoid power outages for users as much as possible; the operation and maintenance department library includes operation and maintenance units and local operation and maintenance companies. Nowadays, the scale of the power grid is huge, and the workload of operation and maintenance of the distribution network is huge. There are often multiple maintenance and operation and maintenance departments, who are responsible for different plants and lines. In order to propose accurate control measures for the corresponding lines, it is necessary to know which operation and maintenance department the lines or plants that need to be maintained belong to; the new energy library will All distributed power sources count their grid-connected points and grid-connected lines.

Step 2. Risk location: obtain the equipment (or line) to be repaired, and combine with the network topology map to retrieve the location of the equipment to be repaired.

Specifically, the location of the equipment or line to be repaired is retrieved, and then the affected equipment and line are located. According to the information of the network topology map and the location information of the equipment or lines that need to be repaired and maintained, the network topology map is further retrieved, the input positioning is realized through the name index, and then the line index is used to obtain the plant name or line name related to the input device. Wait.

As an implementation, it is done using the xlrd function in Python. Xlrd is an extension tool for reading excel, which can realize the reading of formulating forms and specified cells.

Step 3. Risk analysis: When the equipment or line to be repaired is determined, it is assumed that another power supply path fails during the repair and maintenance process, and the affected loads at the next level are retrieved, and all the affected loads are traversed. If the affected loads have If there is no alternate power path, the load will be de-energized when an accident occurs. Risk analysis is a comprehensive evaluation based on the importance of the loss load and the amount of the loss load. First, based on the current operating state, according to the historical load data of the distribution network, static stability analysis is carried out for the specific operating state of line maintenance and equipment maintenance, and then risk assessment is carried out. There are two sets of standards for risk level assessment. The importance level of the load is used to evaluate the risk level, and the second is to use the power outage risk to evaluate the risk level. As shown in Figure 3, it specifically includes the following steps:

Step 301: Initialization, when equipment or lines are overhauled, find out the weak links in the operation of the distribution network, that is, traverse all affected power equipment sets.

Step 302: Select a device, analyze the network topology map to obtain the load carried by the device to be repaired, check whether the load carried by the device is an important load, if it is an important load, check whether the load has a backup power supply path, and if so, enable the backup The power supply path is updated, and the power grid topology is updated; if there is no backup power supply path, the load will lose power, which is called the loss load, and the risk level is directly determined according to the importance level of the loss load.

Step 303 : If the equipment does not carry an important load, calculate the loss of load when the equipment is out of service for maintenance; traverse all affected equipment, calculate the total loss load, and determine the risk level according to the total loss load. In other words, traverse all the loads carried by the equipment to be repaired, the loads with backup power supply paths, start the backup power supply paths, and update the network topology, the loads without backup power supply paths will lose power, and the loss loads of all power failures are summed up, that is It is the sum of the lost loads; the risk level is determined based on the sum of the lost loads: if the sum of the lost loads is greater than or equal to 100MW, it is defined as a fifth-level risk; if the sum of the lost loads is greater than or equal to 40MW and less than 100MW, it is defined as a sixth-level risk; when the sum of the lost loads is less than 40MW, it will not be rated .

The evaluation criteria for evaluating the risk level by using the load level of the power equipment are as follows:

(1) If all the 220 kV plants and stations carried by the power equipment are out of power (that is, the power loss load is the 220 kV plants and stations), the risk level is defined as the five-level risk.

(2) If the first-level important user of the power equipment loses power, the risk level is defined as the fifth-level risk.

(3) If all the 110 kV plants and stations carried by the power equipment are out of power (that is, the power loss load is 110 kV plants and stations), the risk level is defined as the six-level risk.

(4) If all the 110 kV busbars of the 220 kV plant and station carried by the power equipment lose power, the risk level is defined as a six-level risk.

Most power loads will have two power supply paths. To conduct risk analysis, when one of the power supply paths is overhauled, assuming that the other power supply path is also faulty, based on the historical load data, retrieve the network topology map to check the impact of power outages. scope.

If the equipment to be repaired is a transformer or incoming line of a 220kV plant, as shown in Figure 4, during maintenance, if another transformer or incoming line fails, all outgoing lines of the plant will lose power. First search the plant station in the 220kV database, then extract all the outgoing lines of the plant station, and traverse the 110kV lines carried by the plant station. The 110kV lines may carry 110kV plant stations or user loads and local power plants. Search in the database, find the 110kV plant station with the 110kV line, check the other incoming line of the 110kV plant station and its superior plant station, if the two incoming lines are from the same plant station, then the 110kV plant station must be Loss of power. If the two incoming lines come from different plants and the above situation occurs, it is only necessary to switch the 110kV plant to another superior plant, which can avoid the power loss of the plant. If the outgoing line of 110kV cannot be retrieved in the 110kV database, it will be searched in the load user database to see if there is another incoming line in the user station with it. Load users lose power when a fault occurs. After traversing all 110kV outgoing lines, start to traverse 35kV outgoing lines, the steps are the same as above, and retrieve one by one. After retrieving all the lines of this substation, the program stops running.

If the equipment to be repaired is a 110kV line, as shown in Figure 5, the load on the line will be affected. The load brought by 110kV may be 110kV power plant, local power plant and important load. First, search the 110kV line that needs to be repaired in the 110kV database. If the line can be found, check the 110kV plant station carried by the line, and then look at another incoming line of the plant station. If another incoming line of the plant fails when the 110kV line is overhauled, the plant will lose power. If the input line cannot be retrieved from the 110kV database, it will be retrieved from the important load user database, and then check whether there is another incoming line for the user load. To another line, supply power through another incoming line; if there is no other incoming line, the user load must lose power when an accident occurs. If the line cannot be retrieved in the load user database, the local power plant database is finally retrieved. When the line is overhauled, it will be used as the grid connection connection line of the local power plant, which will cause the power plant to be disconnected from the power grid. After the retrieval is complete, the program stops running.

If the equipment to be repaired is a 35kV line, as shown in Figure 6, the load on the line is affected. Search the 35kV line that needs to be repaired in the 35kV database, find the 35kV plant station that the line carries, and then check another incoming line of the plant station. If another incoming line of the plant fails when the 35kV line is overhauled, the plant will lose power. Regardless of whether the input line can be retrieved in the 35kV database, it is necessary to continue to retrieve the line from the important load user database, and then check whether there is another incoming line for the user load. The user is ready to switch to another line, and supply power through another incoming line; if there is no other power supply path, the user load must lose power when an accident occurs. If the line cannot be retrieved in the load database, it means that the line has no load, and the next line is directly retrieved. The program stops running after all lines have been retrieved.

Step 4. Risk management and control: After starting the backup power supply path, based on the network topology map, the lines on the backup power supply path and the operation and maintenance unit of the plant station are retrieved, and risk management and control measures are generated and sent to the operation and maintenance unit. Specifically, based on the retrieval of lines and stations on the backup power supply path, combined with the risk management and control measure template, risk management and control measures are generated. After the path is enabled, strengthen the operation and maintenance protection work, and someone needs to be on duty when restoring the original power supply path.

Specifically, for the equipment plants and stations in the weak links of risk during equipment maintenance, advance maintenance is carried out, and inspections of weak links are strengthened during equipment maintenance. After the risk analysis is completed, when the affected loads are to be deployed to other plants and stations and other lines, it is necessary to search for the spare lines and the operation and maintenance unit of the plants and stations. Carry out inspection and maintenance to prevent power outages after the load is put in. The risk management and control measures of the distribution network before the maintenance plan are obtained, so that the operation and maintenance department can take different maintenance measures for different situations.

Step 5. Risk early warning: Based on the location of the equipment to be repaired, the load carried by the equipment to be repaired, the risk level, the operation and maintenance units on the standby power supply path and the information of the relevant risk management and control measures, combined with the template of the early warning notice, Generate alert notifications.

As an implementation, use Python to extract the content specified in Excel to generate a word document. This function is realized by using the docxtpl package of Python in the present invention. First, create a Word document, which is the format template template of the report you want to generate. The content of this document includes risk analysis, management and control requirements, power failure equipment, etc., and then import all the information into it.

After determining the equipment that needs to be repaired, the present invention retrieves the network topology map through risk positioning, determines the location of the repaired equipment, performs risk analysis based on the location information, analyzes the network topology map, finds out the weak links in the operation of the power grid and predicts possible According to the analyzed risk information, the power outage risk assessment of the distribution network is carried out to obtain the risk level, and the risk management and control are carried out to obtain the risk management and control measures of the distribution network before the maintenance plan, so that the operation The maintenance department takes different maintenance measures for different situations, and finally summarizes all the above information to generate an early warning report. The invention progresses layer by layer. After the maintenance equipment is determined, the database is continuously searched to determine the weak links in the operation of the distribution network, and control measures are given to the weak links, which makes the probability of failure of the distribution network during equipment maintenance and maintenance. It is greatly reduced, and the safety of operation is improved.

Embodiment 2

This embodiment provides a distribution network operation safety risk warning system, which specifically includes the following modules:

a risk location module, which is configured to: obtain the equipment to be repaired, and combine with the network topology map to retrieve the location of the equipment to be repaired;

The risk analysis module is configured to: based on the location of the equipment to be repaired, analyze the network topology map to obtain the load carried by the equipment to be repaired, and determine whether the load carried by the equipment to be repaired is an important load; if it is an important load, find important loads. Whether the load has a backup power supply path, if so, start the backup power supply path and update the network topology; if there is no backup power supply path, the electric charge will be lost, and the risk level will be determined based on the importance level of the lost load; if it is to be repaired If the equipment does not carry an important load, the sum of the loss loads when the equipment to be repaired is out of service is calculated, and the risk level is determined based on the sum of the loss loads.

The risk management and control module is configured to: after starting the backup power supply path, based on the network topology map, retrieve the lines on the backup power supply path and the operation and maintenance unit of the plant station.

The risk early warning module is configured to: based on the location of the equipment to be repaired, the load carried by the equipment to be repaired, the risk level, and the operation and maintenance unit on the backup power supply path, combined with the template of the early warning notice, to generate an early warning notice.

After determining the equipment that needs to be repaired, input it into the risk positioning module, retrieve the network topology map, determine the location of the repaired equipment, and input the location information into the risk analysis module. The risk analysis module analyzes the network topology map, finds out the weak links of the power grid operation and predicts the possible power outage accidents and the load that will be lost when the accident occurs. Enter the information into the risk management and control module, and obtain the risk management and control measures of the distribution network before the maintenance plan in the risk management and control module, so that the operation and maintenance department can take different maintenance measures according to different situations, and finally summarize all the above information in the risk management and control module. The early warning module generates an early warning report. The four modules of the system progress step by step. After the maintenance equipment is determined, the database is continuously searched to determine the weak links in the operation of the distribution network, and control measures are given for the weak links. The probability of failure is greatly reduced, and the safety of operation is improved.

The system of the invention utilizes the grid topology diagram constructed by Excel, which has strong interactivity and is easy to read and modify. And because different levels of power plants have different outgoing lines and loads, their specific logic processes are different, and the system designs different logics for power plants with three voltage levels of 220kV, 110kV, and 35kV. Nowadays, power grid dispatchers need to manually submit risk early warning information every day, especially during the centralized period of equipment maintenance, dispatchers need to edit a large amount of risk early warning information every day, taking up a lot of work time. If the early warning system is used, according to the maintenance plan, it is only necessary to input the equipment lines that need to be repaired, and the early warning report will be automatically generated, and the staff can publish it after the review is completed, which saves the workload of power grid dispatchers and makes the staffing more rational. , release the cost of human resources and create good economic benefits.

Taking the 220kV equipment that needs to be repaired or maintained as an example, in the input interface of the network topology diagram, the human-computer interaction window, the import of the network topology diagram and the input of the maintenance equipment are completed. To import the network topology map, you only need to directly drag the Excel table containing the distribution network topology map into the window. Only after dragging into the table will the output import successful window be displayed. If other forms of files are imported, this prompt box will not be displayed. After the data initialization is completed, you only need to input the equipment that needs to be repaired, and then click the start task. The risk early warning system is put into operation.

When there is a 220kV equipment that needs to be repaired or maintained, the specific operation steps of using this system to generate an early warning report are as follows: First, initialize the data, that is, import the network topology map into the data query input interface, and the data initialization is completed if the import is successful; Assuming that the #2 transformer of the 220kV refining and chemical station needs to be repaired, use this risk early warning system for risk warning, enter the #2 transformer of the 220kV refining and chemical station in the data query window, and then click Start task; The generated risk warning report is named and saved. After clicking save, a window will appear indicating that the save is successful and the program has finished running. Finally, open the risk warning report document, that is, when the #2 transformer of the 220kV refining and chemical station needs to be repaired, the distribution network will run. Safety risk early warning report, the report gives the risks that may occur during the maintenance of the #2 transformer in the 220kV refining and chemical station, analyzes the harm caused by the occurrence of risks, and also gives corresponding control measures, namely operation and maintenance The operation and maintenance center of the department conducts advanced maintenance of the relevant equipment and lines before overhauling the equipment, and focuses on the inspection of the relevant equipment during the overhauling of the equipment; finally, the staff will review the report, and the warning notice will be issued after the review is correct.

It should be noted here that each module in this embodiment corresponds to each step in Embodiment 1 one by one, and the specific implementation process thereof is the same, which is not repeated here.

Embodiment 3

This embodiment provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, implements the steps in the method for early warning of a distribution network operation safety risk as described in the first embodiment.

Embodiment 4

This embodiment provides a computer device, including a memory, a processor, and a computer program stored in the memory and running on the processor, where the processor implements the one described in the first embodiment when the processor executes the program. Steps in a distribution network operation safety risk early warning method.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media having computer-usable program code embodied therein, including but not limited to disk storage, optical storage, and the like.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. During execution, the processes of the embodiments of the above-mentioned methods may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM), or a random access memory (Random Access Memory, RAM) or the like.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A power distribution network operation safety risk early warning method is characterized by comprising the following steps:

acquiring equipment to be overhauled, and searching the position of the equipment to be overhauled by combining a network topological graph;

analyzing the network topological graph to obtain the load carried by the equipment to be overhauled based on the position of the equipment to be overhauled, and judging whether the load carried by the equipment to be overhauled is an important load or not; if the load is an important load, whether the important load has a standby power supply path or not is searched, if so, the standby power supply path is started, and the network topology structure is updated; if the standby power supply path does not exist, the load is lost, and the risk level is judged based on the importance level of the lost load; and if the equipment to be overhauled has no important load, calculating the sum of the loss load of the equipment to be overhauled when the equipment to be overhauled is shut down, and judging the risk level based on the sum of the loss load.

2. The power distribution network operation safety risk early warning method of claim 1, further comprising: after the standby power supply path is started, based on the network topological graph, retrieving operation and maintenance units of lines and stations on the standby power supply path, and generating and sending air risk management and control measures to the operation and maintenance units.

3. The power distribution network operation safety risk early warning method of claim 2, further comprising: and generating an early warning notice form based on the position of the equipment to be overhauled, the load and risk level of the equipment to be overhauled and the risk management and control measures and by combining a template of the early warning notice form.

4. The power distribution network operation safety risk early warning method according to claim 1, wherein the network topological graph comprises an alternating current line segment library, a new energy plant station library, an important load library, an operation and maintenance department door library and a plant station database with a plurality of voltage levels.

5. The power distribution network operation safety risk early warning method according to claim 1, wherein the calculation method of the loss load sum is as follows: searching whether a load carried by the equipment to be overhauled has a standby power supply path, if so, starting the standby power supply path, and updating a network topological structure; if the load has no standby power supply path, the load loses power, and the sum of all the loads losing power is the sum of the lost loads.

6. The utility model provides a distribution network operation safety risk early warning system which characterized in that includes:

a risk localization module configured to: acquiring equipment to be overhauled, and searching the position of the equipment to be overhauled by combining a network topological graph;

a risk analysis module configured to: analyzing the network topological graph to obtain the load carried by the equipment to be overhauled based on the position of the equipment to be overhauled, and judging whether the load carried by the equipment to be overhauled is an important load or not; if the load is an important load, whether the important load has a standby power supply path or not is searched, if so, the standby power supply path is started, and the network topology structure is updated; if the standby power supply path does not exist, the load is lost, and the risk level is judged based on the importance level of the lost load; and if the equipment to be overhauled has no important load, calculating the sum of the loss load of the equipment to be overhauled when the equipment to be overhauled is shut down, and judging the risk level based on the sum of the loss load.

7. The power distribution network operational safety risk early warning system of claim 6, further comprising a risk management and control module configured to: and after the standby power supply path is started, retrieving operation and maintenance units of lines and stations on the standby power supply path based on the network topological graph, and sending operation and maintenance instructions to the operation and maintenance units.

8. The power distribution network operational safety risk early warning system of claim 7, further comprising a risk early warning module configured to: and generating an early warning notice sheet based on the position of the equipment to be overhauled, the load and the risk level of the equipment to be overhauled and the operation and maintenance unit on the standby power supply path by combining a template of the early warning notice sheet.

9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method for operational safety risk early warning of a power distribution network according to any of claims 1 to 5.

10. Computer arrangement comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor when executing the program performs the steps of a method for operational safety risk pre-warning of an electric distribution network according to any of claims 1-5.

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